Microwave surface resistance measurements on the heavy fermion superconductor UPt3

C. T. Lin*, Bimal K. Sarma, J. B. Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The relative change of the microwave surface resistance has been measured as a function of temperature in the superconducting and normal states of UPt3 using a cavity perturbation technique. With our frequency range of ∼9-38 GHz, the microwave photon energy (ℏω) is ∼20-95% of the estimated zero-temperature (BCS) energy gap (2Δ0) of UPt3. The surface resistance shows a change in slope as the signature of TC and has a significantly weaker temperature dependence in the superconducting state than would be predicted by the Mattis-Bardeen theory. At higher frequencies, the slope tends to change by a smaller amount. No indication of collective modes at any of the frequencies was observed down to the lowest temperatures measured (∼0.1 K).

Original languageEnglish (US)
Pages (from-to)424-428
Number of pages5
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number5
StatePublished - 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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